Add 15/12 and 15/90
1st number: 1 3/12, 2nd number: 15/90
15/12 + 15/90 is 17/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
15/12 = 15 × 15/12 × 15 = 225/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
15/90 = 15 × 2/90 × 2 = 30/180 - Add the two like fractions:
225/180 + 30/180 = 225 + 30/180 = 255/180 - 255/180 simplified gives 17/12
- So, 15/12 + 15/90 = 17/12
In mixed form: 15/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/12+15/90 15/12+30/90 15/24+15/90 45/12+15/90 15/12+45/90 15/36+15/90 75/12+15/90 15/12+75/90 15/60+15/90 15/84+15/90